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Title: Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures

Abstract

We have measured the relative yields of the cluster ions (NH{sub 3}){sub {ital n}{minus}1}NH{sup +}{sub 2} and (NH{sub 3}){sub {ital n}}H{sup +}{sub 2} produced by electron impact ionization of a supersonic molecular beam of neutral ammonia clusters, as functions of cluster ion size, neutral beam stagnation temperature, and electron impact energy. Our observation of a magic number at {ital n}=7 in the distribution of (NH{sub 3}){sub {ital n}{minus}1}NH{sup +}{sub 2} cluster ions is interpreted in terms of an intracluster bimolecular association reaction between a nascent NH{sup +}{sub 2} daughter ion and an adjacent NH{sub 3} solvent molecule, giving rise to a protonated hydrazine product ion. Our observation of magic numbers at {ital n}=5 and {ital n}=8 in the (NH{sub 3}){sub {ital n}}H{sup +}{sub 2} cluster ion distribution is consistent with the production of the N{sub 2}H{sup +}{sub 8} Rydberg radical cation via an intracluster ion--molecule reaction. Our experimental results are consistent with recent theoretical predictions concerning the structure and stability of N{sub 2}H{sup +}{sub 8} ions.

Authors:
; ;  [1]
  1. (Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14214 (US))
Publication Date:
OSTI Identifier:
5219084
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; (USA); Journal Volume: 91:11
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; AMMONIA; AGGLOMERATION; ELECTRON-MOLECULE COLLISIONS; AMMONIUM COMPLEXES; CHEMICAL REACTION YIELD; ADDUCTS; IONIZATION; MOLECULAR BEAMS; MOLECULAR IONS; MOLECULAR STRUCTURE; NUCLEATION; STABILITY; SUPERSONIC FLOW; BEAMS; CHARGED PARTICLES; COLLISIONS; COMPLEXES; ELECTRON COLLISIONS; FLUID FLOW; HYDRIDES; HYDROGEN COMPOUNDS; IONS; MOLECULE COLLISIONS; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; YIELDS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Peifer, W.R., Coolbaugh, M.T., and Garvey, J.F.. Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures. United States: N. p., 1989. Web. doi:10.1063/1.457336.
Peifer, W.R., Coolbaugh, M.T., & Garvey, J.F.. Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures. United States. doi:10.1063/1.457336.
Peifer, W.R., Coolbaugh, M.T., and Garvey, J.F.. Fri . "Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures". United States. doi:10.1063/1.457336.
@article{osti_5219084,
title = {Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures},
author = {Peifer, W.R. and Coolbaugh, M.T. and Garvey, J.F.},
abstractNote = {We have measured the relative yields of the cluster ions (NH{sub 3}){sub {ital n}{minus}1}NH{sup +}{sub 2} and (NH{sub 3}){sub {ital n}}H{sup +}{sub 2} produced by electron impact ionization of a supersonic molecular beam of neutral ammonia clusters, as functions of cluster ion size, neutral beam stagnation temperature, and electron impact energy. Our observation of a magic number at {ital n}=7 in the distribution of (NH{sub 3}){sub {ital n}{minus}1}NH{sup +}{sub 2} cluster ions is interpreted in terms of an intracluster bimolecular association reaction between a nascent NH{sup +}{sub 2} daughter ion and an adjacent NH{sub 3} solvent molecule, giving rise to a protonated hydrazine product ion. Our observation of magic numbers at {ital n}=5 and {ital n}=8 in the (NH{sub 3}){sub {ital n}}H{sup +}{sub 2} cluster ion distribution is consistent with the production of the N{sub 2}H{sup +}{sub 8} Rydberg radical cation via an intracluster ion--molecule reaction. Our experimental results are consistent with recent theoretical predictions concerning the structure and stability of N{sub 2}H{sup +}{sub 8} ions.},
doi = {10.1063/1.457336},
journal = {Journal of Chemical Physics; (USA)},
number = ,
volume = 91:11,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1989},
month = {Fri Dec 01 00:00:00 EST 1989}
}